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• ffmpeg streaming simultaneously synchronized delay to multiple social networks

  4 avril 2021, par Jintor

  I'm able to stream simultaneously using ffmpeg to youtube, twitter, facebook, twitch ... simultaneously BUT the issue is the following : each network have their own delay

  


  in 1 network : 15 seconds delay, an other : 10 seconds delay, etc

  


  I tried 2 different ways

  


  • 1 ffmpeg per network => Signal is strong and stable

  


  • 1 ffmpeg with tee muxer to many at once => horrible, unstable, 1 network accepts it and some other says signal poor or too low bitrate...

  


  ----------- for example I use this for each social network ------------------------------

  


  /usr/bin/ffmpeg -re -i input.mp4 -deinterlace -c:v libx264 -pix_fmt yuv420p 
-preset veryfast -tune zerolatency -c:a aac -b:a 128k -ac 2 -crf 18 -r 30 -g 60  
-b:v 2369k -minrate 2369k -maxrate 2369k -ar 44100 -qscale:v 2 -vf "scale=-2:1080" 
-profile:v main -bufsize 2369k -f flv "rtmp://a.rtmp.youtube.com/live2/key"


  


  ---

  


  


  • I know that it's a case by case basis and not easy to do, but Is there a way to "fake" a delay with ffmpeg (like youtube->x delay, facebook-> y delay, etc) ?

    


  


  • or is there any synchronizing mechanism or timing option in ffmpeg ?

    


  


  • or any other approach ?

    


  


  


• Swift : How can I generate Mp4 video from programmaticall output ? [closed]

  21 août 2020, par Mount Ain

  This question is specifically to Swift programming language for Linux & macOS platforms.To understanding the concept, I used Swift programming language. But not depend on Swift programming language. C or C++ is also good to me.

  


  I can generate JPEG image from NSView by using NSBitmapImageRep. But Linux I don't what I want to do. So, the first thing I need to know is the step to generate JPEG image by programmatically without using the NSView. I really don't know How hard it is. But I want to learn how it's work. I feel It's the way to fill the color into pixels one by one to combine a Image. But I don't know How to do in programming. I knew the same way is used in videos by packing the series of image with audio & subtitle & other meta info.

  


  If you ask about compression, I really want to know How Twitter & YouTube compressing uploaded videos without loss of quality.

  


  So what is the concept,

  


  

  1. To generate a JPEG image by programmatically without using NSView ?

  


  2. To generate MPEG-4 video by group of JPEG images ?

  


  


  Thanking in advance...

  


• Anomalie #4220 : Articles qui changent de langues

  12 novembre 2018, par denis -

  Salut, voici déjà plus d’infos sur un site où ça survient régulièrement. Je ne sais pas d’où vient le bug, directement de spip où d’un des plugins listés ci-dessous. C’est évidemment difficile de reproduire le bug dans un site nu vu qu’il ne survient sans doute après une opération spécifique qui ne se produit que tout les x semaines.

  Est-ce qu’il serait possible dans un premier temps de logger toutes les requêtes sql ? Pour pouvoir tracer l’origine du problème.

  SPIP 3.2.1 [23954]

  Abonnement à des listes de diffusion 1.1.12 - stable
  Agenda 3.18.7 - stable
  Champs Extras 3.11.5 - stable
  Facteur 3.5.2 - stable
  Ma lettre 3.3.6 - stable
  MailShot 1.23.0 - stable
  MailSubscribers 2.7.1 - stable
  Menu de langues avec liens 1.3.3 - stable
  Metas + 1.2.8 - stable
  Métadonnées pour Open Graph, Duclin Core et Twitter
  Mini Calendrier 2.4.1 - stable
  Newsletters 1.5.3 - stable
  NoSPAM 1.5.18 - stable
  oEmbed 2.0.5 - stable
  Saisies pour formulaires 2.24.3 - stable
  Sedna 1.3.5 - stable
  Agrégateur RSS
  SPIP Bonux 3.4.6 - stable
  Traduction d’articles autrement 1.4.3 - stable